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This article explains the operation of the Spring IoC container, the DIP principle, dependency injection, XML bean definitions, custom and static factories, FactoryBean usage, bean scopes (singleton and prototype), and demonstrates their behavior with Java code examples.
Spring Boot can emulate SPI plug‑in extensions by using native Java ServiceLoader, conditional bean registration with @ConditionalOnClass/@ConditionalOnProperty, custom FactoryBean implementations, or programmatic BeanDefinitionRegistryPostProcessor registration, each enabling dynamic service loading based on configuration or runtime conditions.
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This article presents a design pattern for a unified, annotation‑driven HTTP client in a Spring‑based payment system, detailing custom annotations, dynamic proxy enhancement, and bean registration via FactoryBean and ImportBeanDefinitionRegistrar, with complete code examples and a summary of key concepts.
This article explains the differences between Spring’s ObjectFactory and FactoryBean interfaces, demonstrates how they are used internally for bean creation, dependency injection, and servlet API injection, and shows how to customize ObjectFactory behavior to resolve bean conflicts and inject specific implementations.
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This article provides an in‑depth exploration of Spring's core concepts—including the IOC container, ApplicationContext vs BeanFactory, bean instantiation lifecycles, and the role of FactoryBean—supplemented with diagrams and source code excerpts to help Java developers understand the framework's inner workings.